plugs RSPSF-SH Series Resealable Push in Plugs, Sulphur Free These rubber seal plugs are sulphur free and are designed for standard copper tube dimensions. They protect and seal tubing used in various applications including HVAC components and medical tubing. The press fit and self-sealing material allows for the injection of gas to keep the tube clean, free of contaminates and dry during shipment and storage. * Temperature rating: 300°F (149°C) Material: EPDM Rubber Color: Blue for standard copper applications, Green for Medical copper appilcations 210 * For other material and color options, contact customer service.